<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>登录界面</title>
    <style>
        body{
           background-color: gray;
            /*background-image: url("");*/
            /*width: 100%;*/
            /*height: 100%;*/
        }


        .one{
            font-size: 15px;
            border-radius: 20px;
            border: 1px solid white;
            height: 300px;
            width: 400px;
            margin: 0 auto;
            margin-top: 200px;
            text-align: center;
            background-color: gainsboro;
        }




    </style>

</head>
<body>
<div class="one">`
    <h2>登录页面</h2>
    <hr color="white">

    <div style="margin-top: 30px;">

       <p><label>用户名：</label><input type="text" value="" placeholder="请输入账号"></p>
        <p><label>密&nbsp&nbsp码：</label><input type="text" value="" placeholder="请输入密码"></p>
        <input type="button" value="登录" style="width:80px;">

   </div>
</div>
</body>
</html>